I just wanted to put this up as I see more and more 997.1 Turbos with this issue. There is a fuel pressure regulator reference line that is on the passenger side of the car. It is a hard plastic line connected to a little section of vacuum tubing.
Out of all the .1 Turbos we tune I bet we see 50%-60% of them have these lines blown off. It is very easy for them to come off and most of the time people don't even know it. The 997.1 can run very lean with out a misfire most of the time so a lot of people don't really know.
We see it instantly in logs and just want to remind people to check the lines or check your logs! If you are logging with the Accessport check your short term fuel trims under boost. If it reads 1.25 on both banks that mean this is probably affecting you. I do believe the Durametric can log short term fuel trims as well.
I know this has been talked about before, but I want to bring it back up. BBI did a write up on this some time ago:
If anyone wants me to check logs even if you do not have an AP but would like to know, send them over happy to take a quick look. If you are in So Cal I would bet BBI would still be happy to check for you for free.
I have put a log of what generally happens:
You can see under boost the fuel trims shoot up to 1.25. This is a good indicator that the car has this issue.
If anyone has questions please feel free to let me know!